All crucibles, alumina, magnesia and zirconia to name a few, are manufactured in Capital's own modern purpose-built facility in the Czech Republic where we press, cast and fire various materials into crucibles.
Capital Refractories is able to supply a full range of isostatically pressed crucibles from 2 kg capacity to 75 kg, in different grades and qualities. We use a state-of-the-art semi-automated cold isostatic press. Cold isostatic pressing applies pressure to the workpiece in all directions producing products of uniform density.
The advantages of Isostatically Pressed Crucibles are:
Crucibles are produced by vibration casting (vibrocast) when the required size or shape is uneconomical or impractical by the isopressing production method.
Capital Refractories can offer a range of vibration cast crucibles, including T-Pot Ladles:
Complex shapes, e.g. internal pouring siphon
To complement our range of crucibles we also offer numerous ancillary products and materials used within the investment and related foundry industries.
|Alumina||.....||General purpose crucible with good resistance to acidic and basic slags.|
|.....||AL97I||Superior erosion resistance|
|.....||AL88I||Improved thermal shock resistance|
|Chrome Alumina||.....||Chrome-enriched crucible has high resistance to slags. Preferred to alumina in more arduous applications|
|.....||CA93I||Superior erosion resistance|
|.....||CA84I||Improved thermal shock resistance|
|.....||CA91I||Specially formulated to withstand the most severe thermal shock applications|
|Chrome Alumina CA93I||93.4||2.2||<0.1||3.6|
|Chrome Alumina CA84I||84.3||9.0||0.2||4.8|
|Chrome Alumina CA91I||91.5||2.2||<0.1||5.3|
|Quality||Bulk Density / g cm-3||Apparent Porosity / %||Thermal Excpansion / x10-6 K-1||Thermal Conductivity / W m-1 K-1||Maximum Service Temperature / °C|
|Chrome Alumina CA93I||3.05||23.0||8.2||3.4||1800|
|Chrome Alumina CA84I||2.85||20.0||7.6||3.4||1730|
|Chrome Alumina CA91I||3.10||21.5||8.2||3.4||1800|